Cal Newport writes about his daily “shutdown” technique. It’s not unlike what Aaron and Dave talked about on [episode 6](http://www.70decibels.com/homework/2012/4/27/006-the-mental-office.html) of their Home Work podcast, [which spurred me](http://shawnblanc.net/2012/05/the-mental-office/) to start a new habit of jotting down the mental loose ends of my day and basically debriefing myself so that when I step away from my computer for the day my mind is clear.
(This of course should not be confused with trying to kick out [the top idea in your mind](http://www.paulgraham.com/top.html).)